Abstract
This paper reports the method to measure the stem diameter variation of vine tree (Kyoho) by using a strain-gauge type micro-displacement detector and its application to analyze water content in plant tissue. Our purpose is to establish how to control soil moisture conditions for the restricted root sphere cultivation of Kyoho tree. The results of this study are as following.
(1) The optimal measuring portion of stem diameter variation were the cane.
(2) The relationship between stem shrinkage and water potential in stem tissue were expressed as linear regression lines with high coefficient of correlation.
(3) The water deficit of the tested vine trees were easily analyzed by the stem diameter measurement.
(4) The water content variation was mainly affected by the irradiation intensity and secondarily by matering to the soil.
